CN103480980B - A kind of 309 stainless flux-cored wires of low Cr VI discharge - Google Patents
A kind of 309 stainless flux-cored wires of low Cr VI discharge Download PDFInfo
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- CN103480980B CN103480980B CN201310432889.6A CN201310432889A CN103480980B CN 103480980 B CN103480980 B CN 103480980B CN 201310432889 A CN201310432889 A CN 201310432889A CN 103480980 B CN103480980 B CN 103480980B
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- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims abstract description 12
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- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
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- FGCGALPUFOSDIE-UHFFFAOYSA-N chromium nickel Chemical compound [Cr][Ni][Cr] FGCGALPUFOSDIE-UHFFFAOYSA-N 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
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- 210000004185 liver Anatomy 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3608—Titania or titanates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
A kind of 309 stainless flux-cored wires of low Cr VI discharge, it is made up of medicine core and external application steel band, and described medicine core accounts for the 15%-30% of welding wire gross weight, and its Chinese medicine core respectively forms the percentage accounting for medicine core weight and is: hafnium metal powfer: 25-28%, metal nickel powder: 13-16%, electrolytic manganese metal 4-8%, aluminium powder: 1-4%, rutile: 20-25%, quartz: 4-7%, zircon sand: 3-6%, feldspar 3-5%, MnO
2: 2-6%, ice crystal: 1-2%, MFC additive: 1-5%, surplus is iron powder; MFC additive comprises Zn:25-45%; Cu:5-15%; Si:2-10%; Polytetrafluoroethylene (PTFE): 15-30%, fluorographite: 1-5%; Li
2cO
3: 20-40%; After mechanical mixture, 200-300 DEG C need be heated to stir in electric furnace.The present invention develops a kind of low Cr VI (Cr
+ 6) discharge, 308 stainless flux-cored wires that welding procedure is excellent.
Description
Technical field
The present invention relates to be applicable to soldering stainless steel and carbon steel or low alloy steel dissimilar welding, stainless compound steel plate coating the field of welding material such as bottoming welding, particularly relate to the low Cr VI (Cr in weld fumes
+ 6) gas shielded 309 stainless flux-cored wire of content.
Background technology
Stainless flux-cored wire welding austenitic stainless steel has that efficiency is high, cost is low, automaticity is high, and processing performance is good, and appearance of weld is attractive in appearance; Deposition rate is fast, and production efficiency is high, and burn-off rate is fast, and its deposition rate is about the feature of 85%-90%, is the direction of stainless steel welded technical development.
In stainless steel, the content of Cr is higher, and welding material can add appropriate Cr element in order to the corrosion resistance meeting weld seam, makes weld seam produce enough corrosion resistances to meet welding requirements.In wlding and mother metal, Cr evaporate and enters weld fumes under welding high temperature action, wherein partly can be oxidized to the virose Cr VI (Cr of tool
+ 6).
Cr VI (Cr
+ 6) in human body, there is carcinogenesis, also can cause other many health problems, the hexavalent chromium compound as sucked some higher concentration can cause rhinorrhea, sneezes, itch, nosebleed, ulcer and perforation of nasal septum.The contact of short-term heavy dose, can produce adverse consequences in contact site, comprises ulcer, schneiderian membrance stimulates and perforation of nasal septum.Absorption over much dosage can cause the damage of kidney and liver, nauseating, GI irritation, gastric ulcer, spasm are even dead.Skin contact can cause ulcer or allergic reaction Cr VI (Cr
+ 6) be one of the easiest anaphylactic metal, be only second to nickel.In order to ensure the health of welding personnel, 2006 Occupational Safety and Health Administration of the U.S. (OSHA) newly promulgated Cr VI (Cr in weld fumes
+ 6) permission exposure limit value (PEL), be reduced to 3 μ g/m3 by 52 original μ g/m3 in 8 hours, and be recommended as 0.2 μ g/m further 2010
3.
For stainless flux-cored wire, reduce Cr VI (Cr
+ 6) stability of product, reduce the active oxygen around electric arc, improving arc stability is reduce Cr VI (Cr
+ 6) main path.Therefore, the present invention develops a kind of low Cr VI (Cr
+ 6) discharge, 309 stainless flux-cored wires that welding procedure is excellent.
Summary of the invention:
The present invention is formed in view of the foregoing, its object is to provide a kind of low Cr VI (Cr
+ 6) discharge capacity, 309 stainless flux-cored wires that welding procedure is outstanding.
To achieve these goals, the present invention is by the following technical solutions:
A kind of low Cr VI (Cr
+ 6) 309 stainless flux-cored wires that discharge, it is made up of medicine core and external application steel band, and described external application steel band is the austenic stainless steel belt that phosphorus content is less than 0.03% (weight).
Described medicine core accounts for the 15%-30% of welding wire gross weight, its Chinese medicine core respectively forms the percentage accounting for medicine core weight: hafnium metal powfer: 25-28%, metal nickel powder: 13-16%, electrolytic manganese metal 4-8%, aluminium powder: 1-4%, rutile: 20-25%, quartz: 4-7%, zircon sand: 3-6%, feldspar 3-5%, MnO
2: 2-6%, ice crystal: 1-2%, MFC additive: 1-5%, surplus is iron powder;
Above-mentioned MFC additive comprises Zn, Cu, Si, polytetrafluoroethylene (PTFE), fluorographite and Li
2cO
3, their weight ratio is followed successively by Zn:25-45%; Cu:5-15%; Si:2-10%; Polytetrafluoroethylene (PTFE): 15-30%, fluorographite: 1-5%; Li
2cO
3: 20-40%; After mechanical mixture, 200-300 DEG C need be heated to stir in electric furnace.
Further, the diameter of wherein said welding wire is between 0.9-1.6mm.
Raw material are Zn powder: 80-120 order, Cu powder: 120-200 order, primary polytetrafluoroethylene (PTFE) (PTFE) powder, fluorographite (CH
4f
2) 100-200 order, Li
2cO
3: 80-200 order, after mechanical mixture, need heat 200-300 DEG C, polytetrafluoroethylene (PTFE) (PTFE) is melted, need to stir after taking-up in electric furnace.
In deposited metal, the content of essential element is at following scope: C:0.021 ~ 0.03wt.%; Cr:22 ~ 25wt.%; Ni:12 ~ 14.0wt.%; Mn:0.5 ~ 2.5wt.%; Si:0.3 ~ 1wt.%; Fe: surplus.
309 flux-cored wires are used in austenitic stainless steel welding as above, and wherein said external application steel band is preferably the 304L stainless steel band that phosphorus content is less than 0.03% (weight).
309 flux-cored wires are used in austenitic stainless steel welding as above, and the diameter of wherein said welding wire is preferably between 0.9-1.6mm.
One is used for being added in 309 stainless flux-cored wires and suppresses Cr VI (Cr
+ 6) additive that generates, it is by Zn-Cu-Si-polytetrafluoroethylene (PTFE) (PTFE)-fluorographite (CH
4f
2)-Li
2cO
3, their weight ratio is followed successively by 25-45%, 5-15%, 2-10%, 15-30%, 1-5%, 20-40%.And the granularity of additive is 80-160 order.
A kind of low Cr VI (Cr
+ 6) preparation method of discharge austenite 309 stainless flux-cored wire, step is as follows:
Step 1: according to the recipe configuration good medicine core powder of described medicine core, austenic stainless steel belt phosphorus content being less than 0.03% (weight) is bundled into U-shaped, adds the medicine core powder accounting for this welding wire gross weight 18-25% in U-lag;
After capable for U groove heals up by step 2, successively through forging, roll, the process of drawing tube reducing finally obtains welding wire;
Step 3 pair welding wire surface is cleared up, and obtains the final products of the stainless steel welded flux-cored wire of described austenite 309.
Beneficial effect of the present invention is:
Reduce Cr VI (Cr in stainless steel welded flue dust
+ 6) mainly solved by three approach.Method one: by the active material in additive, reduces the active oxygen (O around electric arc in welding process
3), reduction divalence, tetravalence chromium are oxidized to the probability of sexavalence.Method two: with the Li in additive
2cO
3replace K, the Na in medicine core, make Cr VI (Cr
+ 6) not becoming stable thing phase, final automatic classifying becomes divalence, tetravalence chromium.Method three: in additive, dystectic material is to Cr VI (Cr
+ 6) there is reduction, reduce the Cr VI (Cr generated
+ 6) be called divalence, tetravalence material.The material that in the present invention, additive relates to is selected through a large amount of, and content is at 1-5%, and granularity, at 80-160 order, controls weight percent oxide in medicinal powder simultaneously and is less than 45%.
Low Cr VI (Cr of the present invention
+ 6) discharge austenite 309 stainless flux-cored wire can reduce 30-70% Cr VI (Cr in weld fumes
+ 6) content, the advantages such as have good processing performance, namely have arc stability high, spatter is few simultaneously, and the removability of slag is good.
The present invention is applicable to 100%CO
2gas shielded arc welding, quality of weld seam molding is good, the metallurgical imperfections such as pore-free, crackle, slag inclusion.In deposited metal, the content of essential element is in following scope: in deposited metal, the content of essential element is at following scope: C:0.021 ~ 0.03wt.%; Cr:22 ~ 25wt.%; Ni:12 ~ 14.0wt.%; Mn:0.5 ~ 2.5wt.%; Si:0.3 ~ 1wt.%; Fe: surplus, this welding wire is applicable to austenitic stainless steel welding, is particularly suitable for welding space little, uses, can reduce Cr VI (Cr under the not smooth environment that ventilates
+ 6) discharge, reduce Cr VI (Cr
+ 6) harm to human body.
Detailed description of the invention
Flux-cored wire of the present invention is by the restriction of following example, and any improvement in the scope that claim of the present invention is protected and change are all within protection scope of the present invention.
The invention provides a kind of low Cr VI (Cr
+ 6) discharge the thin diameter flux-cored wire of 309 stainless steel, it is made up of external application steel band and welding wire medicine core wherein, and its instantiation mode is as follows:
Described welding wire medicine core composed as follows:
Crome metal: transition chromium element in welding wire deposited metal, its weight percentage is (accounting for the weight percentage of medicinal powder, as follows) 25-28%.
Metallic nickel: transition nickel element in welding wire deposited metal, its weight percentage is 13-16%.
Electrolytic manganese metal: transition manganese element in welding wire deposited metal, its weight percentage is 4-8%.
Aluminium powder: play deoxidation, improve the transfer coefficient of the alloying elements such as chromium, nickel, manganese, its percentage by weight is: 1-4%.
Rutile: main slag former, can improve the removability of slag and the forming quality of weld metal, and can also improve the stability of electric arc, its percentage by weight is: 20-25% simultaneously.
Quartz: main slag former, increases the acidity of slag, the viscosity of adjustment slag and oxidisability, and refinement molten drop, improve fusing coefficient, but addition too much easily reduces quality of weld seam molding, its weight percentage is 4-7%.
Zircon sand: main slag former, the physical and chemical performance of adjustment slag, improves the removability of slag of weld metal, and improve fusing coefficient, its weight percent content is 3-6%.
Feldspar: for slag making, the physical and chemical performance of adjustment slag, can also play the effect of stable arc, refinement molten drop, but addition crosses conference increase Cr VI (Cr
+ 6) growing amount, its weight percentage is feldspar 3-5%.
Ice crystal: for dehydrogenation, improves arc performance, and increase the mobility of weld seam skull, its weight percentage is preferably 1-2%.
Additive: its function reduces the active oxygen around welding arc, suppresses Cr VI (Cr
+ 6) generate stable compound, the Cr VI (Cr that reduction has generated
+ 6), its percentage by weight is preferably 1-5%.
Described additive is by Zn-Cu-Si-polytetrafluoroethylene (PTFE) (PTFE)-fluorographite (CH
4f
2)-Li
2cO
3, their weight ratio is followed successively by 25-45%, 5-15%, 2-10%, 15-30%, 1-5%, 20-40% and the granularity of additive is 80-160 order.
Cr VI (Cr in weld fumes is affected in stainless flux-cored wire
+ 6) active oxygen of factor mainly around electric arc of content, its main source is the oxide in medicinal powder.Next is the compound of K, Na, and it can make Cr VI (Cr
+ 6) generate stable compound.Deoxidier in general welding wire is that Al, Mg are still due to its oxidized temperature and Cr VI (Cr
+ 6) temperature that generates is not in same scope, therefore, Al, Mg are to Cr VI (Cr in weld fumes
+ 6) content impact little.Additive of the present invention, by Zn-Cu-Si-polytetrafluoroethylene (PTFE) (PTFE)-fluorographite (CH
4f
2)-Li
2cO
3, their weight ratio is followed successively by 25-45%, 5-15%, 2-10%, 15-30%, 1-5%, 20-40%.And the granularity of additive is 80-160 order composition.It had both included and had been reduced in Cr VI (Cr
+ 6) when generating, the material of the active oxygen around electric arc, suppress Cr VI (Cr
+ 6) generate the material of stable compound and include again the Cr VI (Cr that reduction generated
+ 6) species.Final arrival reduces 30-70% Cr VI (Cr
+ 6) object.The advantages such as have good processing performance, namely have arc stability high, spatter is few simultaneously, and the removability of slag is good.
The manufacture of 309 stainless flux-cored wires of the present invention adopts following steps:
1) by thickness 0.25-0.6mm, the low-carbon austenitic band of width 8-12mm is bundled into U-shaped, adds the medicinal powder accounting for welding wire gross weight 15-30% of the present invention in U-lag.
2) after being healed up by capable for U groove, by roll forming, drawing tube reducing, its diameter is finally made to reach between 0.9-1.6mm.
3) welding wire surface is cleared up, obtain final products.
Embodiment 1
Select thickness 0.25mm, width 8mm, weight are the low-carbon austenitic band of 4555g, are bundled into U-shaped, by 250g hafnium metal powfer, 130g metal nickel powder, 40g electrolytic manganese metal, 40g aluminium powder, 250g rutile, 70g quartz, 60g zircon sand, 30g feldspar, 20gMnO
2, 10g ice crystal, 10g additive (Zn:2.5g; Cu:1.5; : Si:1g; Polytetrafluoroethylene (PTFE): 2g, fluorographite: 0.5g; Li
2cO
3: 2.5g), 90g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 18% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 0.9mm.
Embodiment 2
Select thickness 0.4mm, width 12mm, weight are the low-carbon austenitic band of 4000g, are bundled into U-shaped, by 280g hafnium metal powfer, 160g metal nickel powder, 80g electrolytic manganese metal, 10g aluminium powder, 200g rutile, 40g quartz, 30g zircon sand, 50g feldspar, 60gMnO
2, 20g ice crystal, 50g additive (Zn:12.5g; Cu:5; : Si:5g; Polytetrafluoroethylene (PTFE): 10g, fluorographite: 2.5g; Li
2cO
3: 15g), 20g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 20% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 0.9mm.
Embodiment 3
Select thickness 0.3mm, width 8mm, weight are the low-carbon austenitic band of 3546g, are bundled into U-shaped, by 253g hafnium metal powfer, 140g metal nickel powder, 50g electrolytic manganese metal, 10g aluminium powder, 210g rutile, 45g quartz, 37g zircon sand, 40g feldspar, 30gMnO
2, 15g ice crystal, 40g additive (Zn:12.8g; Cu:6; : Si:3.2g; Polytetrafluoroethylene (PTFE): 8g, fluorographite: 2g; Li
2cO
3: 8g), 130g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 22% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 1.2mm.
Embodiment 4
Select thickness 0.4mm, width 10mm, weight are the low-carbon austenitic band of 3000g, are bundled into U-shaped, by 260g hafnium metal powfer, 140g metal nickel powder, 40g electrolytic manganese metal, 20g aluminium powder, 230g rutile, 50g quartz, 40g zircon sand, 30g feldspar, 20gMnO
2, 10g ice crystal, 20g additive (Zn:6g; Cu:2; : Si:2g; Polytetrafluoroethylene (PTFE): 6g, fluorographite: 1g; Li
2cO
3: 3g), 140g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 25% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 1.6mm.
Embodiment 5
Select thickness 0.6mm, width 12mm, weight are the low-carbon austenitic band of 2333g, are bundled into U-shaped, by 260g hafnium metal powfer, 140g metal nickel powder, 40g electrolytic manganese metal, 20g aluminium powder, 220g rutile, 40g quartz, 30g zircon sand, 35g feldspar, 30gMnO
2, 15g ice crystal, 33g additive (Zn:7.26g; Cu:4.29; : Si:3.3g; Polytetrafluoroethylene (PTFE): 6.6g, fluorographite: 1.65g; Li
2cO
3: 6.6g), 137g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 30% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 1.6mm.
Embodiment 6
Select thickness 0.4mm, width 10mm, weight are the low-carbon austenitic band of 4263g, are bundled into U-shaped, by 255g hafnium metal powfer, 136g metal nickel powder, 50g electrolytic manganese metal, 30g aluminium powder, 230g rutile, 55g quartz, 40g zircon sand, 35g feldspar, 40gMnO
2, 17g ice crystal, 40g additive (Zn:12.8g; Cu:6; : Si:3.2g; Polytetrafluoroethylene (PTFE): 8g, fluorographite: 2g; Li
2cO
3: 8g), 73g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 19% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 0.9mm.
Comparative example 1
Select thickness 0.4mm, width 10mm, weight are the low-carbon austenitic band of 3167g, are bundled into U-shaped, by 250g hafnium metal powfer, 130g metal nickel powder, 53g electrolytic manganese metal, 24g aluminium powder, 200g rutile, 50g quartz, 30g zircon sand, 30g feldspar, 30gMnO
2, 10g ice crystal, 0g additive, 193g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 24% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 1.6mm.
Comparative example 2
Select thickness 0.3mm, width 8mm, weight are the low-carbon austenitic band of 3762g, are bundled into U-shaped, by 260g hafnium metal powfer, 105g metal nickel powder, 52g electrolytic manganese metal, 24g aluminium powder, 210g rutile, 30g quartz, 30g zircon sand, 60g feldspar, 30gMnO
2, 25g ice crystal, 2g additive (Zn:0.25g; Cu:0.1; : Si:0.1g; Polytetrafluoroethylene (PTFE): 0.2g, fluorographite: 0.5g; Li
2cO
3: 0.3g), 172g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 21% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 1.2mm.
Comparative example 3
Select thickness 0.3mm, width 8mm, weight are the low-carbon austenitic band of 4882g, are bundled into U-shaped, by 263g hafnium metal powfer, 134g metal nickel powder, 40g electrolytic manganese metal, 14g aluminium powder, 210g rutile, 40g quartz, 20g zircon sand, 40g feldspar, 30gMnO
2, 15g ice crystal, 60g additive (Zn:13.2g; Cu:7.8; : Si:6g; Polytetrafluoroethylene (PTFE): 12g, fluorographite: 3g; Li
2cO
3: 12g), 134g iron powder, altogether 1000g medicinal powder, add after mixing in U-type groove, filling rate is 17% (weight), heals up through tube reducing, bright annealing, again tube reducing, and final finished gage of wire is 0.9mm.
To the evaluation of each embodiment and comparative example performance
1. Cr VI (Cr in weld fumes
+ 6) content
Air-suction cover in flue dust collecting device can 360 degree of rotations, in flexible inhalation arm, universal joint is housed, signature can be gone up, all around move, sucked by soot dust granule material, then collected in measurement unit's time below weld fumes weight 1.5g/min is excellent, is greater than 1.5g/min for poor, Cr (VI) content according to the standard detection every kilogram flue dust of ISO16740, its result in Table 1.Metewand is with content 1.6-1.8 × 10 of traditional 309 stainless flux-cored wires
3mg/Kg, when lower than 1.5 × 10
3during mg/Kg be " excellent, be greater than 1.3 × 10
3during mg/Kg be " poor ".
2. mechanical property
Tensile strength is evaluated based on GB/T 17853-1999.Its result is displayed in Table 3.When meeting the evaluation of tensile strength be " excellent, when not meeting be " poor ".In addition, based on GB/T17853-1999 evaluate extensibility time, when its metewand be more than 25% be " excellence ", lower than 25% time be " poor ".
3. ferrite number
Survey number instrument with ferrite to measure with reference to the ferrite content of division lines method to sample in GB/T 1954-2008 " chromiumnickel austenite stainless steel weld seam ferrite content measuring method ".For ensure measurement result statistically and reasonability, covering the welded seam area within melt run to each sample, random selecting 20 visual fields measure, and get the mean value of 20 measurement results as final tested volume, its result is in table 3.Metewand be ferrite number FN when 5%-12% for " excellence ", lower than 5% or higher than 12% time be " poor "
4. welding wire spatter loss coefficient
Spatter loss coefficient assessment method adopts semiclosed case to collect splashing, and test test piece for welding (size 300 × 30 × 20mm, Q235 carbon steel sheet) is placed on testing stand, losing, being covered, welding in copper cover with conductive copper cover for preventing from splashing; Carry out being welded on welding on test plate (panel) with automatic welding carriage and be about the weld seam of 250mm together, postwelding collects the splashing metallic particles in copper cover on testing stand, and claim its weight, its result in table 3.Metewand is for " excellence " below 0.5%, higher than 0.5% time be " poor ".
Spatter loss coefficient ψ computing formula is as follows:
M in formula
2-splashing weight (g);
M
1-welding wire expendable weight (g).
5. overall merit
As overall merit, welding operation (Cr in arc stability, spatter loss coefficient, flue dust
+ 6content) and deposited metal performance (hot strength, ballistic work, FN number) all meets " excellent " time be evaluated as ⊙, even if when having any one project appraisal for difference, overall merit is also ×.
The low Cr of table 1
+ 6, low cost stainless steel metal core 309 evaluation result
As shown in table 1, embodiment 1-6 is low Cr VI Cr
+ 6discharge 309 stainless flux-cored wires, its medicine core composition meets scope of the present invention so comprehensive performance evaluation is " excellent ", and comparative example 1-3 does not meet scope of the present invention, and wherein 1,2 additive levels are low, make Cr VI (Cr in weld fumes
+ 6) do not reach qualified, the additive of No. 3 is too high, and the splashing of welding wire is increased, and therefore comprehensive performance evaluation is defective.
Claims (3)
1. 309 stainless flux-cored wires of one kind low Cr VI discharge, it is made up of medicine core and external application steel band, described external application steel band is the austenic stainless steel belt that phosphorus content is less than 0.03wt%, described medicine core accounts for the 15%-30% of welding wire gross weight, it is characterized in that: its Chinese medicine core respectively forms the percentage accounting for medicine core weight and is: hafnium metal powfer: 25-28%, metal nickel powder: 13-16%, electrolytic manganese metal 4-8%, aluminium powder: 1-4%, rutile: 20-25%, quartz: 4-7%, zircon sand: 3-6%, feldspar 3-5%, MnO
2: 2-6%, ice crystal: 1-2%, MFC additive: 1-5%, surplus is iron powder;
Above-mentioned MFC additive comprises Zn, Cu, Si, polytetrafluoroethylene (PTFE), fluorographite and Li
2cO
3, their weight ratio is followed successively by Zn:25-45%; Cu:5-15%; Si:2-10%; Polytetrafluoroethylene (PTFE): 15-30%, fluorographite: 1-5%; Li
2cO
3: 20-40%; After mechanical mixture, 200-300 DEG C need be heated to stir in electric furnace.
2. 309 stainless flux-cored wires of low Cr VI discharge as claimed in claim 1, the diameter of wherein said welding wire is between 0.9-1.6mm.
3. 309 stainless flux-cored wires of low Cr VI discharge as claimed in claim 1, Zn powder in described MFC additive: 80-120 order, Cu powder: 120-200 order, polytetrafluoroethylene powder 100-200 order, fluorographite 100-200 order, Li
2cO
3: 80-200 order.
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